Gravity pneumatic lid check



Jun so, 1925.

E. V. WYATT GRAVITY PNEUMATIC LID CHECK Filed May 16, 1923 n 0 an bw Q WN N D My \mhl w. m m Wm a m v /\Q% w w L1 i i \n 3 ne \NW 4 R N QPatented June 30, 1925.

PATENT OFFICE.

ERNEST V. WYATT, 0F NEXV YORK, N. Y.

I GRAVITY PNEUMATIC LID CHECK.

Applicationfiled May 16, 1923.

To all 10710772 it may concern:

Be it known that I, ERNEST V. VYATT, a citizen of the United States, andresident of the borough of Manhattan, city of New York, in the county ofNew York and State of New 'York, have invented certain new and usefulImprovements in a Gravity Pneumatic Lid Check, of which the following isa specification.

This invention relates to a gravity pneumatic lid check.

The organization of the invention comprises a pneumatic cylinder with apiston and piston rod. The said rod at its upper end is hinged to a lidof a receptacle. The cylinder is trunnioned to the top wall of thereceptacle in an opening therein. The lower end of the cylinder containsa valve for the discharge of compressed air and its operation can becontrolled by the operator. A spring tensioned clamping arm locks thepiston of the cylinder in place, when it is located in its raisedposition.

The object of the invention is the production of a gravity pneumatic lidcheck, by means of which the lid of a receptacle can be lowered withoutjar or noise and which is automatically locked when in its raisedposition. A second object of the invention is the production of apneumatic lid check, in which the pressure of the air therein can easilybe controlled for lids of diflerent weight.

Various other objects will be evident from the description and claims.

The lid check is specially applicable to the receptacles of phonographs,but it may be used for various other receptacles and is applicable whena lid or swinging mem her is to be gently lowered.

In the accompanying drawings Fig. 1 represents a Vertical section of areceptacle with its lid, with the pneumatic lid check partially in'axiallongitudinal section connected thereto; Fig. 2 shows a plan View of somedetails; Fig. 3 indicates a. section of Fig. l on the line 3, 3 and Fig.4: shows a section of Fig. 1 on the line 4, 4.

A receptacle is indicated with the front wall 20, the rear wall 21, thebottom wall 22 and the top wall 23 having the longitudinal guide slot24: and the opening 25. A lid 30 is hinged to the top edge of the wall21, by means of the hinge 31.

The lid check is indicated to comprise the opening 40 connects saidarms.

Serial No. 639,356.

, journal openings 33 at its upper end and the latch opening 34 in itswall. A bracket is I indicated in its entirety by the letter A. The saidbracket comprises a pair of inclined members 35, each of which at itsupper end terminates in the trunnion 36. Arms 37 with openings 38 extendfrom the members 35, and an apron 39 with the latch The in clinedmembers 35 with their trunnions 36 extend into the opening 25 of the topwall 23. The bracket A is "fastened in place by means of screws ll,which extend through the openings 38 in the arms 37 and engage the topwall 23. The trunnions 36 engage the journal openings of thecylinder-I32,-

by means of which said cylinder is enabled to swing. todifferentpositions. A head with the interior thread 46 is fastened tothe lower end of the cylinder 32. A. threaded sleeve 47 engages theopening .1-6. An axial opening 48 in the upper end of the sleeve 47,connects with the axial opening 49 at the lower end thereof. A port 50in the sleeve 47 connects with the opening A9. The lower portion of the.opening A9 is threaded for the needle valve 54-, having the tip end Aball valve 56 is located in the opening l8 and normallycloses the upperend ofthe opening 49. The tip end 55 of the needle valve 54 can belocated to bear up against the ball valve 56 and raise it, so that itwill be spaced a predetermined distance from its seat, and therebypredetermined amounts of air can escape from the cylinder as will bedescribed.

A piston is located in the cylinder 32 and is indicated in its entiretyby the letter B. The piston comprises the disk 60, upon which is locatedthe cup shaped packing 61. A latch bracket comprises the longitudinalmember 62 with the latch opening 63, the lower member 6A and the topguide member 65. A disc 66 bears on the lower member 64:. A piston rod70 extends into the cylinder 32 and has formed at its lower end thethreaded shank 71, which latter is smaller in diameter than the mainportion of said rod. The threaded shank 71 extends through openings inthe disc 66, the lower member 64, the cup shaped packing 61 and the disc60. A nut 72 is in threaded engagement with the shank 71 and clampstogether the elements thereon. A journal bracket 73 is fastened to thelid and the upper end of the piston rod 70 is pinned to the bracket 73by means of the pin 74.

A spring clamping arm is indicated in its entirety by the letter C, andcomprises the curved spring member 78 practically in a horizontal plane,which is twisted to a vertical plane at 79 to form the rear member 80.An operating bar 81 extends from the arm 80. The bar 81 at its top endis twisted ninety degrees to form the handle 82, and is also twistedninety degrees at its lower end to form the foot 83. The foot 83 isfastened to the wall 20, by means of the screw 85,

' and the upper portion of the arm 81. extends through and is guided inthe longitudinal guide slot 24. The outer end of the member 78 extendsthrough the opening 40 in the apron 39. To operate the gravity pneumaticlid check, and to open the lid 30 it is manually raised as indicated inthe drawing until the outer end of the curved spring member 78 lookswith the latch opening 63 of the latch bracket. The lid 30 will then besecurely locked in its raised position. The latch bracket. remains inits locked position, by reason ot' the tension of the arm 78 and bar 81.\Vhen it is desired to'lowe'r the lid theoperato-r moves the handle 82in the direction of the arrow D, against the tension of the arm 81, andthe outer end of the arm 78 will .unlock from the latch opening 63. Thelid 30 will then swing down'and the piston B will lower in the cylinder32, against. the pressure of the air in the lower end thereof. Thepressure of the air is controlled by the position 01" the tip end of theneedle valve. 54:. If the said tip end 55 does not touch the ball valve56, the latter is fully seated on its valve seat, completely closing theupper end oi: the opening 49, and

the only air that can escape from the cylinder 32 is that due to leakageof the piston.

B. hen the tip end 55 bears up against the ball valve 56, some of theair escapes through the opening 49 and the port 50. The amount ofpressure in the lower end of the cylinder 32 is thus controlled by theneedle valve 54. For lids of heavy weight .the pressure in the lower endof the cylinder Having described my invention whatl desire to secure byLetters Patent and claim is: y

In a pneumatic check the combination, of a cylinder trunnioned to thewall of a receptacle, a piston adapted to move in said cylinder, apiston. rod with one end thereof 5 extending from said piston auditsother, end pinned to the hinged lid of the receptacle, a spring clampingarm comprising a spring member and an operating bar, the lower end ofthe bar fastened to a wallet the receptacle and the outer end of thespring member adapted to lock with an element extending from said pistonat a predetermined position thereof, said bar adapted to swing to movethe spring member and means to control the extent of the swing of saidbar.

Signed at the borough oi Manhattan, city otNew York in the county: of-New York and State of New York, this 26th day of April A; D. 1923.

: ERNEST V. WVYATT.

